1 // NOTE: Assertions have been autogenerated by utils/update_cc_test_checks.py 2 // RUN: %clang_cc1 -x c++ -emit-llvm %s -o - -triple x86_64-linux-gnu | FileCheck %s 3 // RUN: %clang_cc1 -x c++ -fsanitize=pointer-overflow -fno-sanitize-recover=pointer-overflow -emit-llvm %s -o - -triple x86_64-linux-gnu | FileCheck %s 4 5 #include <stdint.h> 6 7 struct S { 8 int x, y; 9 }; 10 11 // CHECK-LABEL: @_Z23get_offset_of_y_naivelyv( 12 // CHECK-NEXT: entry: 13 // CHECK-NEXT: ret i64 ptrtoint (ptr getelementptr inbounds nuw ([[STRUCT_S:%.*]], ptr null, i32 0, i32 1) to i64) 14 // 15 uintptr_t get_offset_of_y_naively() { 16 return ((uintptr_t)(&(((S *)nullptr)->y))); 17 } 18 19 // CHECK-LABEL: @_Z27get_offset_of_y_via_builtinv( 20 // CHECK-NEXT: entry: 21 // CHECK-NEXT: ret i64 4 22 // 23 uintptr_t get_offset_of_y_via_builtin() { 24 return __builtin_offsetof(S, y); 25 } 26